Good question. I don't mean the sellers. But rather the accounts that are being sold. Meaning that the buyer of such an account will have wasted 10$. Don't see why would anybody pay for a +1 account though. Especially since they will eventually open the gates to everyone.
So imagine you are a black hat for a moment. You've run your drive by malware campaign and harvested a couple hundred thousand Google login credentials, or maybe you just sit and wait and when the browser is open you send a +1 to the site your master told you to send it to.
So now Google has hundreds of +1 votes coming from otherwise legitimate users. How do they fight that?
Good point. Had not thought of that. Although it would probably become kind of obvious that there is something fishy going on. Why would a site that has no real value all of a sudden start getting a lot of +1s? They would have to be really subtle to go undetected.
